1905-1906.] 
329 
clays upon which the Esher rests. Hence the value of these 
records. At Greenland we counted 300 boulders, each 100 
taken at random, from a different level in the section : all were 
erratics, and the proportion in which they occured varied in a 
definite ratio for each level— 100 at Castle Espie, similarly 
pro\ed to be all erratic boulders. In the Black Mountain deposit, 
discovered by Mr. Bell, the only place I have seen in our 
district with distinct upper and lower boulder clays (the latter 
being so 1 hard that hammer and chisel were required to extract 
ita stones), 270 out of 274 were erratics; at Cloghanport 331 
out of 339, with percentages at other localities varying down to 
17 per cent, at Carnmoney and Bloody Bridge, XXXV. The 
latter has been considered a, moraine deposit, and contained 
only a few travelled rocks, including a fragment of the 
porphyry dyke on the shore, 100 feet beneath, but no chalk nor 
flints were found in it. 
Another point noted in our schedules is the frequent oc- 
currence of some erratics and rarity of others. Of 107 varieties 
we found 26 at Dromore, XXXI., 27 at Ballyholme, 28 at 
Cloughfin, 33 at Newry, and 44 different rocks — almost 40 per 
cent, of the total list of rock varieties in the brickfields round 
Belfast, 10 out of 44 being isolated records of erratics, not as 
yet found elsewhere, showing the value of patient, persistent 
investigation, such as Mr. Bell devoted to them. Glacialists 
who may wish to study the matter more fully are referred to the 
tables accompanying this summary, and can examine our valu- 
able list and collection of erratics at the Museum and the 
manuscript schedules with detailed descriptions of localities 
investigated. 
When commencing work, we were frequently assured that 
we would, never find erratics north of their place of origin. Our 
experience does not at all bear out this assertion, which 
postulates a simple, southward ice-flow, and omits to reckon, 
with radiating local systems of glaciation that may have per- 
sisted over high ground prior to, and long after, the great 
central plain of Ireland and the Irish Sea were free from solid 
ice. A scrutiny of the tables giving the compass direction of 
